michigan’s water well construction program · michigan’s water well construction program...
TRANSCRIPT
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Michigan’s Water Well Construction Program
Drinking Water and Environmental Health SectionResource Management Division
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Michigan Groundwater Michigan Groundwater StatisticsStatistics
• 45% of Michiganders are on groundwater• 18% are on groundwater-dependent
community water supply systems• Statewide, we use about 700 million
gallons of groundwater per day• About 500 million gallons of that is
for household use• Remainder goes to irrigation and industry
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Michigan Groundwater StatisticsMichigan Groundwater Statistics
Estimated Groundwater Usage in Michigan (in million gallons per day)
Industrial110 mgd
(14%)Private
Household Wells
239 mgd(31%)
Public Water Supplies247 mgd
(32%)
Irrigation - Agricultural
135 mgd(18%)
Irrigation - Golf Courses 20.6 mgd (2.7%)
Livestock10.2 mgd
(1.3%)
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Groundwater • Groundwater is
present in geological formations below the land surface.
• Precipitation recharges the groundwater.
• Water (and liquids) from the surface are pulled through the surface soils and the geological formations by gravity.
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AquiferAn aquifer is a subsurface formation that will yield groundwater to a well or spring in a usable and sustainable quantity.
Unconsolidated Aquifer•Not cemented or formed into a solid unit by pressure•Generally granular and can be broken by “hand”•Sand, gravel, silt, clay
Consolidated Aquifer•Cemented or formed into a solid unit by pressure•Typically “hard” and not breakable by “hand”•Sandstone, shale, limestone, other rocks
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Michigan’s Water WellConstruction Program
Incorporates a preventive public health strategy to ensure that newly installed water
well systems are safe and reliable
Proper and sanitary well construction is the key to a safe
water supply!
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Statute: Part 127 – Water Supply and Sewer SystemsAct 368, PA 1978, as amended (Public Health Code)
• Part 1 – Well Construction Code• Part 2 - Drilling Contractors’ &
Pump Installers’ Registration • Part 3 – Drilling Machines & Service
Vehicles• Part 4 - Dewatering Wells
FIRST BECAME EFFECTIVE FEB. 14, 1967LAST REVISION – EFFECTIVE APRIL 21, 1994
For public water supply wells - ApplyPart 8, Act 399, PA 1976 in addition to Part 127, Public Health Code
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COMPONENTSOF A
SAFE & RELIABLE WATER WELL
PROPERWELL
CONSTRUCTIONMATERIALS
SANITARYWELL
COMPLETIONPRACTICES
TRAINEDPROFESSIONALWATER WELL
CONTRACTORS
PROPERWATER SYSTEM
MAINTENANCEROUTINE
MONITORINGOF
WATERQUALITY
TARGETAQUIFER HASAMPLE YIELD
&SAFE WATER
SUFFICIENTSEPARATION
FROMCONTAMINATION
SOURCES
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WELLS MOST VUNERABLETO MICROBIAL
CONTAMINATION
DEFICIENT WELL HEAD(CRACKED WELL CAP
OR OPEN VENT)
SEWER LINE BREAK,SEWAGE OVERFLOW
OR CROSS-CONNECTION
FLOODING,BURIED WELL HEAD
OR SUBMERGEDIN WELL PIT
TOO CLOSE TO SEPTIC SYSTEM,
AGRIC. RUNOFF ORABANDONED WELL
SHALLOW DEPTH(OR SHORT CASING
IN BEDROCK)
POOR CONSTRUCTION(UNSEALED ANNULUS
OR DUG WELL)
OLD WELLS WITH CORRODED
WELL CASING
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MICHIGAN’S PROACTIVE, PUBLIC HEALTH ORIENTED APPROACH:
SOUND WELLCONSTRUCTION
PRACTICES& SAFE
AQUIFERS
PROPER LOCATION OF WELL(AWAY FROM
CONTAMINATION SOURCES)
WATER
TESTING
VS.REACTIVE, “BODY-COUNT” APPROACH:
IDENTIFY PROBLEM
THROUGH WATERTESTINGOR WHENILLNESSOCCURS
CORRECT WATER SYSTEM
DEFICIENCY
WATER TREATMENT
TO OVERCOMEPOOR AQUIFER SELECTION OR
WELL CONSTRUCTION
FREQUENTWATER
TESTING
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It’s all about PROTECTING PUBLIC HEALTH!
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Private & Type III Water Supply Program
Administered as a JOINT EFFORT between Michigan’s local health departments (LHD) and the DEQ
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Branch-Hillsdale-St. JosephCentral MichiganDelta-MenomineeDistrict #2District #4District #10Greater ThumbIron-DickinsonLMASMid-MichiganNorthwest MichiganVan Buren-CassWestern Upper Peninsula
Local Health Departmentsin the State of Michigan
CLARE
ISABELLA
ALCONA
ALLEGAN
ALPENA
ARENAC
BERRIEN CASS
GENESEE
GLADWIN
IOSCO
KENT
LAPEER
OAKLAND
OGEMAW
OSCEOLA
OSCODA
PRESQUE ISLECHEBOYGAN
ROSCOMMON
MACOMB
VAN BUREN
ST CLAIR
MASON
MANISTEE
MIDLAND
BARAGA
ALGER
ANTRIM
BARRY
BAY
BENZIE
BRANCH
CALHOUN
CHIPPEWA
CLINTON
DELTA
EATON
EMMET
GOGEBIC
GRATIOT
HOUGHTON
HURON
INGHAM
IONIA
IRON
JACKSON
LENAWEE
LUCE
MACKINAC
MECOSTA
MONROE
NEWAYGOOCEANA
ONTONAGON
OTSEGO
OTTAWA
SAGINAW
SANILAC
SCHOOLCRAFT
TUSCOLA
WASHTENAW WAYNE
WEXFORD
LEELANAU
DICKINSON
MENOMINEE
KEWEENAW
CHARLEVOIX
CRAWFORDKALKASKAGRAND
TRAVERSE
MISSAUKEE
LIVINGSTON
KALAMAZOO
HILLSDALEST JOSEPH
LAKE
MARQUETTE
MONTCALMMUSKEGON
MONTMORENCY
SHIAWASSEE
27
66
31
42
7
10
8 23
78 12 30
67
37
18 266
72
21
55
68 1
65 35
16 71
60 4
6462
4353
51 83 57
40 20
54
32
79 74
36
22
2
75
48
49
59 29
19
24
15
5 69
80
14
5217
28
956
7361
70 41 34
3
7625 44 77
33 47 63
50
39 13 38 81 82
11 46 58
45
Barry-EatonBenzie-Leelanau
44 LHDs SERVING MICHIGAN’S 83 COUNTIES
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Contact the LHD
regarding:
Permit requirements
Well locations & deviations
Water well records
Water sampling & quality
Water supply inspections
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Provide well that meets needs of owner
Obtain highest yield with minimal drawdown (consistent w/ aquifer capabilities)
Provide suitable quality water (potable and turbidity-free for drinking water wells)
Provide long service life (25+ years)
NEW: Minimize impacts on neighboring wells & aquatic environments
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DRILLED
DRIVEN
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DRILLED WELLS
Terminated in glacial drift (sand, gravel) or bedrock
Constructed with rotary, cable tool, jetting, hollow rod or auger drilling methods
2 in. or larger casing (Domestic wells: 4 – 6 inch diameter)
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DRILLED WELLS
Casing material: Steel or PVC plastic
Installed by well drilling contractors
Much more common than driven or dug wells
Most are >50 ft. deep (avg. 125 ft.)
MOST SANITARY WELL TYPE
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Cable ToolRotary
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DRILLED WELL COMPONENTS
WELL CAP or SEAL
BOREHOLE
CASING
GROUT
PACKER
SCREEN
SCREENED
WELL
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Sanitary well cap(overlapping &self-draining)
Electrical conduit
Well casing pipe
Screened airvent on undersideof well cap
Tight sealbetween cap and casing
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HAND-DRIVEN WELLS
Installed in glacial drift only -CANNOT be driven thru boulders or into bedrock
Well point driven into ground with post-driver, tripod w/ weight or sledge hammer
1 1/4 in. to 2 in. diameter
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DRIVEN WELLS
Installed by property owners
Common around lakes and high water table areas
MORE SUSCEPTIBLE TO SURFACE CONTAMINATION THAN DRILLED WELLS
Most <35 ft. deep, limited yield (7 gpm or less)
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TRIPOD
1 ¼ IN. CASING
CASING DRIVER
WELLS BEING DRIVEN
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IRRIGATION WELLSConstruction must comply with Part 127
Permit is required in “most“ countiesWater well and pump record is required
Vary in size – 1 ¼” to 30”+
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2” IRRIGATION WELLPROPERLY CONSTRUCTED
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10” IRRIGATION WELLNOT PROPERLY CONSTRUCTED
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4” PVC IRRIGATION WELLNOT PROPERLY CONSTRUCTED
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5” IRRIGATION WELLNOT PROPERLY LOCATED
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Loops of polyethylenepipe installed in vertical boreholes
Number & depth ofboreholes dependson heating/coolingload of building
Vertical Closed-Loop Field
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CLOSED LOOP GEOTHERMAL
SYSTEMSARE NOT REGULATED
BY THE STATE OF MICHIGAN
OPEN LOOP GEOTHERMAL
SYSTEMSARE REGULATED BY
THE STATE OF MICHIGAN
GEOTHERMAL REGULATION
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Some county health departments require permits for closed-loops through
locally-adopted ordinances
Examples (Not inclusive listing):DHD No. 2 (Alcona, Ogemaw, Iosco, Oscoda) DHD No. 4 (Alpena, Cheboygan, Montmorency
Presque Isle)DHD No. 10 (Crawford, Kalkaska, Lake, Manistee,
Mason, Mecosta, Missaukee, Newaygo,Oceana, Wexford)
KentLuce-Mackinac-Alger-Schoolcraft District HDMarquetteMonroeOaklandShiawasseeWashtenawWestern Upper Peninsula DHD (Baraga, Gogebic, Houghton, Keweenaw,
Ontonagon)
PERMITPERMIT
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Available at:
www.michigan.gov/deqwaterwellconstruction
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If you want more information:• Ground Source Heat PumpResidential and Light CommercialDesign and Installation Guide,2009, International Ground Source Heat Pump Association (IGSHPA), Oklahoma State University
• Closed-Loop/Geothermal Heat PumpSystems, Design and ConstructionStandards,2009, IGSHPA
• Guidelines for the Construction of Vertical Boreholesfor Closed Loop Heat Pump Systems, Second Edition, 2009, National Ground Water Association
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DEQ’s Well Construction
Website
ManualsLHD GuideContractor DirectoryLinks to
Water Well Records
Fact SheetsEnforcement
ActionsPolicies & Guidance
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REMEMBER…..
ALWAYS DRINK UPSTREAM OF THE HERD